08171: [ibm5170] lemmings: Floppy disk emulation

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08171	Media Support	Critical (emulation)	Always	Jan 3, 2022, 08:49	Jan 6, 2022, 17:56

Tester	ArcadeShadow	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows 10/11 (64-bit)
Status [?]	Acknowledged			Driver	pc/ibmpc.cpp
Version	0.239	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	08171: [ibm5170] lemmings: Floppy disk emulation
Description	The lemmings game has a copy protected floppy disk track. The game worked until Mame 0.211 version. From 0.212 version, MAME's floppy disk emulation doesn't recognize the protected track of the floppy disk.
Steps To Reproduce
Additional Information
Github Commit

Flags
Regression Version	0.211
Affected Sets / Systems	[ibm5170] lemmings

Attached Files

No.19628 Tafoid Administrator Jan 5, 2022, 02:45	Can you tell me exactly how (from command line) you are loading this and what machine are you using to do so for I can see it working in 0.211 and not working in current? Also, are there additional steps needed to start it or is it something autobooting? I did note that in current hashes, the image itself is listed as not working (preliminary) in ibm5150. Are you sure since there is a lemmings entry in both ibm5170 and ibm5150, it isn't confusing them?
No.19636 ArcadeShadow Tester Jan 5, 2022, 12:41	I'm using the machine [at386] with 2 floppy disk drives and one hard disk The game isn't autoboot, you need to start the machine with a hard disk with MS DOS or a MS DOS disk inserted. those are the slot devices that I have configured: # SLOT DEVICES board1:fdcsmc:fdc:0 35hd board1:fdcsmc:fdc:1 525dd The game was added wrongly to the ibm5150 software list in this last MAME version, I commented that on the PR (because it is already in the ibm5170). https://github.com/mamedev/mame/pull/9018 I added the game in the ibm5170 software list, on the MAME 0.206 version and it worked until 0.211. From 0.212 the game shows the message that the floppy disk needs to be inserted in the drive.
No.19643 crazyc Developer Jan 6, 2022, 17:56	It's likely that https://github.com/mamedev/mame/commit/def5ea3da15d2cf21474bdaeb97f9979a332fe71 caused this. I think that only OG is going to be able to fix it.